SK35A-LTP Equivalent & Substitute Parts

Part Overview

The SK35A-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 3A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for fast recovery rectification applications requiring low forward voltage drop.

Due to its obsolescence status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, maintenance, and new design implementations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	500 µA @ 50 V	µA
Technology	Schottky	-
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-50°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SK35A-LTP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50V
Current - Average Rectified (Io): Must equal or exceed 3A
Technology: Schottky or equivalent fast recovery rectifier technology
Package / Case: DO-214AC (SMA) surface mount package
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

RoHS3 Compliance: Required for regulatory alignment
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred
Operating Temperature Range: Must accommodate application requirements

Substitute parts are grouped into two categories:

Category 1 - Full Electrical Equivalents (50V, 3A, Schottky): Parts that maintain identical voltage and current ratings with Schottky technology, ensuring direct functional replacement without circuit redesign.

Category 2 - Reduced Voltage Equivalents (40V, 3A, Schottky/Super Barrier): Parts with lower voltage ratings (40V) but matching 3A current capacity. These are suitable only for applications where the actual operating voltage does not exceed 40V, providing cost or performance optimization opportunities.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Technology	Package	Product Status	Temp Range
SK35A-LTP	Micro Commercial Co	50V	3A	750 mV @ 3A	Schottky	DO-214AC (SMA)	Not For New Designs	-50°C ~ 125°C
B150-13-F	Diodes Incorporated	50V	1A	700 mV @ 1A	Schottky	DO-214AC (SMA)	Active	-65°C ~ 150°C
B250A-13-F	Diodes Incorporated	50V	2A	700 mV @ 2A	Schottky	DO-214AC (SMA)	Active	-65°C ~ 150°C
B350A-13-F	Diodes Incorporated	50V	3A	700 mV @ 3A	Schottky	DO-214AC (SMA)	Active	-55°C ~ 150°C
CDBA340-HF	Comchip Technology	40V	3A	500 mV @ 3A	Schottky	DO-214AC (SMA)	Active	-50°C ~ 150°C
MBRA340T3G	onsemi	40V	3A	450 mV @ 3A	Schottky	DO-214AC (SMA)	Active	-55°C ~ 150°C
RB058L-40TE25	Rohm Semiconductor	40V	3A	700 mV @ 3A	Schottky	DO-214AC (SMA)	Not For New Designs	-55°C ~ 150°C
SBR3A40SAQ-13	Diodes Incorporated	40V	3A	480 mV @ 3A	Super Barrier	DO-214AC (SMA)	Active	-65°C ~ 150°C
SS15	Taiwan Semiconductor Corporation	50V	1A	750 mV @ 1A	Schottky	DO-214AC (SMA)	Active	-55°C ~ 150°C
STPS140A	STMicroelectronics	40V	1A	550 mV @ 1A	Schottky	DO-214AC (SMA)	Active	-55°C ~ 150°C
STPS140AY	STMicroelectronics	40V	1A	650 mV @ 2A	Schottky	DO-214AC (SMA)	Active	-40°C ~ 150°C

Engineering Selection Recommendations

Primary Recommendation: B350A-13-F

The B350A-13-F from Diodes Incorporated is the optimal direct replacement for the SK35A-LTP. This part maintains identical electrical specifications (50V, 3A, Schottky technology) with superior product status (Active), ensuring long-term availability and supply chain stability. The part is ROHS3 compliant, AEC-Q101 qualified for automotive applications, and features an extended operating temperature range (-55°C ~ 150°C) compared to the original part. Forward voltage characteristics are comparable (700 mV @ 3A versus 750 mV @ 3A), making it functionally equivalent for most applications.

Secondary Recommendation: CDBA340-HF

The CDBA340-HF from Comchip Technology is suitable for applications where the operating voltage does not exceed 40V. This part offers superior forward voltage performance (500 mV @ 3A) and maintains 3A current capacity with fast recovery characteristics. High inventory availability (655,100 pcs) supports production continuity. This option is appropriate for cost optimization in voltage-constrained applications.

Alternative Recommendation: MBRA340T3G

The MBRA340T3G from onsemi provides the lowest forward voltage drop (450 mV @ 3A) among 40V-rated alternatives, beneficial for efficiency-critical applications. This part is Active status with ROHS3 compliance and suitable for designs where operating voltage remains below 40V.

Not Recommended for New Designs:

RB058L-40TE25 carries "Not For New Designs" status, similar to the original SK35A-LTP. While functionally viable, this part should not be selected for new product development due to obsolescence trajectory.

Parts with reduced current ratings (B150-13-F, SS15, STPS140A, STPS140AY) are not suitable as direct replacements for 3A applications but may serve in lower-current circuit branches.

Frequently Asked Questions (FAQ)

Q: Can B350A-13-F directly replace SK35A-LTP without circuit modification?

A: Yes. The B350A-13-F maintains identical voltage (50V) and current (3A) ratings with Schottky technology and DO-214AC package. Forward voltage is slightly lower (700 mV versus 750 mV @ 3A), which improves efficiency. No circuit redesign is required.

Q: What is the difference between 50V and 40V rated parts?

A: The 50V rating provides 10V additional reverse voltage margin. Parts rated 40V are suitable only when the actual circuit operating voltage does not exceed 40V. Using a 40V part in a 50V application risks diode failure. Verify circuit maximum voltage before selecting 40V alternatives.

Q: Why do some substitute parts have lower forward voltage drops?

A: Forward voltage characteristics vary by manufacturer and internal diode design. Lower Vf values (such as MBRA340T3G at 450 mV) indicate improved efficiency and reduced heat generation. This is a performance advantage when voltage ratings and current capacity are maintained.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original SK35A-LTP requirement.

Q: What does "Not For New Designs" status mean?

A: This designation indicates the part is obsolete or approaching end-of-life. Manufacturers no longer recommend these parts for new product development. The SK35A-LTP and RB058L-40TE25 carry this status. Active-status parts (B350A-13-F, CDBA340-HF, MBRA340T3G, SBR3A40SAQ-13) are preferred for new designs.

Q: Can I use a 1A part (B150-13-F, SS15) instead of a 3A part?

A: No. Current rating must equal or exceed the application requirement. Using a 1A part in a 3A circuit causes excessive heat, voltage drop, and potential diode failure. Current ratings are not interchangeable downward.

Q: What is the difference between Schottky and Super Barrier technology?

A: Both are fast recovery rectifier technologies suitable for this application. Super Barrier (SBR3A40SAQ-13) offers comparable performance with different internal construction. Selection depends on specific application requirements and availability.

Q: Are automotive-qualified parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive applications. B350A-13-F and SBR3A40SAQ-13 carry this qualification. For non-automotive applications, non-qualified parts are acceptable.

Q: What is the significance of operating temperature range differences?

A: The original SK35A-LTP operates -50°C ~ 125°C. Most substitutes extend this range to -55°C ~ 150°C or -65°C ~ 150°C. Verify your application's temperature requirements. Extended range provides additional design margin but is not necessary if your circuit operates within the original range.

Q: Why is inventory quantity listed for each part?

A: Inventory levels indicate supply availability. Parts with higher inventory (B350A-13-F: 35,400 pcs; CDBA340-HF: 655,100 pcs) offer better supply chain security for production planning.

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